Elements
What is a unique and pure substance in its simplest form.
Element
When the atoms of two or more elements join together to create a new substance, it's called______.
What is a compound
Two types of mixtures are__________ and__________.
Homogenous and heterogeneous.
Mixtures_____ be separated physically.
Protons and neutrons
Orbiting the nucleus of an atom is k own as the________.
Nucleus
_____is an example of a compound
H2o
Substances within a mixture can easily be_______ by physical means.
separated
A ________is the combing of two or more substance without a chemical bond
Molecule
Elements are different form one another based on the number of______ in their nucleus.
Name 5 examples of a compound?
Water, baking soda, salt ,Hydrogen Peroxide
In a mixture, the element mix together but the properties do not____________.
Chemically bond
What are 3 examples of homogenous mixtures.
Sugar, Yeast, Milk.
All of the atoms of the same element have the ________ number of _______in their neutrons.
Same , Protons
In order to create a compound , a____________must occur to bond elements together.
Chemical reaction
A ___________ mixture does not look the same throughout. You can see the different parts of the mixtures easily.
heterogeneous
What are 3 example of heterogeneous mixtures
Solid, Liquid and Gas
their are over__________ known substances that are combination of elements.
20 millon
Chemical reactions can create new compounds or ____________ an existing compound in its original elements.
Break down
Earth is made up mostly of 4 elements: What is it?
oxygen, silicon,hydrogen,carbon
What are 2 categories of pure substances?
Elements and compounds